How to use org.jboss.windup.graph.dao.exception

  @Override
  public T getByUniqueProperty(String property, Object value) throws NonUniqueResultException {
    Iterable<T> results = getByProperty(property, value);
    
    if(!results.iterator().hasNext()) {
      return null;
    }
    
    Iterator<T> iter = results.iterator();
    T result = iter.next();
    
    if(iter.hasNext()) {
      throw new NonUniqueResultException("Expected unique value, but returned non-unique.");
    }
    
    return result;
  }
}

  @Override
  public T getByUniqueProperty(String property, Object value) throws NonUniqueResultException {
    Iterable<T> results = getByProperty(property, value);
    
    if(!results.iterator().hasNext()) {
      return null;
    }
    
    Iterator<T> iter = results.iterator();
    T result = iter.next();
    
    if(iter.hasNext()) {
      throw new NonUniqueResultException("Expected unique value, but returned non-unique.");
    }
    
    return result;
  }
}